The unstained tower breaks and bends knee to the forgotten sign.
This refers to the tower breaking and the Aes Sedai swearing fealty to Rand. The "forgotten sign" isn't the ancient symbol of Aes Sedai, which people recognize easily, but the actual picture of the dragon, the symbol of Lews Therin Telamon - the forgotten sign.
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Lord of Chaos
"Epilogue"
The unstained tower breaks and bends knee to the forgotten sign.
This refers to the tower breaking and the Aes Sedai swearing fealty to Rand. The "forgotten sign" isn't the ancient symbol of Aes Sedai, which people recognize easily, but the actual picture of the dragon, the symbol of Lews Therin Telamon - the forgotten sign.